Have you ever been driving along when a warning light suddenly appears on your dashboard? Whether it's a flashing engine symbol, a battery warning or an unfamiliar amber light, knowing what your car is trying to tell you can help prevent unexpected breakdowns and expensive repairs.

Modern vehicles use dashboard warning lights to alert drivers to potential mechanical, electrical and safety issues. While some lights are simply reminders, others indicate problems that require immediate attention.

At David Galea Mechanical, we understand how confusing dashboard warning lights can be. Here's our guide to some of the most common car warning lights, what they mean and what you should do when they appear.

• Red warning lights: Generally indicate a serious problem or safety concern that requires immediate attention. Stop somewhere safe and assess the issue.
• Amber or yellow warning lights: Usually indicate a fault or system issue that should be investigated soon.
• Green or blue dashboard lights: Typically provide information about systems currently operating, such as headlights or cruise control.

Remember that warning light colours and meanings can vary between vehicle makes and models, so always refer to your owner's manual.

• Faulty oxygen sensors
• Ignition system problems
• Fuel injection issues
• Emissions system faults
• Engine management sensor failures
• A loose or faulty fuel cap on some vehicles

What should you do?

If the check engine light stays illuminated, arrange a professional diagnostic inspection as soon as practical. If the light is flashing, it may indicate a serious engine misfire that could damage the catalytic converter. Pull over safely, switch off the engine and arrange assistance.

A professional diagnostic scan can help identify stored fault codes, allowing your mechanic to investigate the underlying problem rather than simply clearing the warning light.

What should you do?

Stop driving as soon as it is safe and switch off your engine. Continuing to drive with insufficient oil pressure can cause severe engine damage. Check your oil level according to your vehicle manufacturer's instructions, but don't assume topping up the oil has resolved the issue. If the warning remains illuminated, arrange professional assistance before driving again.

• Faulty alternator
• Damaged or loose drive belt
• Electrical wiring problems
• Charging system faults

What should you do?

If the battery warning light stays on while driving, your vehicle may be running on limited battery power. Turn off unnecessary electrical accessories and stop somewhere safe. Arrange an inspection rather than continuing your journey, as the engine may eventually stall or fail to restart.

• Low coolant levels
• Cooling system leaks
• Faulty thermostat
• Radiator problems
• Cooling fan failure
• Water pump issues

What should you do?

If your engine temperature warning light turns red or the temperature gauge enters the overheating zone, pull over safely and switch off the engine. Never remove the radiator cap while the engine is hot, as pressurised coolant can cause serious burns. Allow the engine to cool and arrange a professional inspection before driving again.

What should you do?

Stop somewhere safe and check whether the parking brake is fully released. If the warning remains illuminated, particularly if the brake pedal feels soft or braking performance has changed, do not continue driving. Arrange professional assistance.

What should you do?

Your conventional brakes may still function, but the anti-lock braking feature could be unavailable. Avoid sudden braking where possible and arrange an inspection promptly. If the ABS light appears alongside the red brake warning light, stop safely and seek assistance.

What should you do?

Stop somewhere safe and inspect your tyres. Check and adjust tyre pressures to the manufacturer's recommended specifications when safe to do so. If a tyre is visibly flat or damaged, do not continue driving on it. If the warning remains after correcting tyre pressures, further investigation may be required.

What should you do?

Arrange a professional inspection promptly. An active SRS fault may prevent some safety components from operating correctly during an accident.

What should you do?

Check whether the system has been manually disabled. If the warning remains illuminated unexpectedly, arrange an inspection.

• Unusual engine noises
• Loss of engine power
• Smoke or burning smells
• Overheating
• Reduced braking performance
• Excessive vibrations or rough running

If you're unsure whether your vehicle is safe to drive, seek professional advice before continuing.

• Unusual engine noises
• Loss of engine power
• Smoke or burning smells
• Overheating
• Reduced braking performance
• Excessive vibrations or rough running

If you're unsure whether your vehicle is safe to drive, seek professional advice before continuing.

However, reading a fault code is only the beginning. A code does not always identify the exact component that needs replacing. Professional diagnostics combine fault code information with testing and mechanical knowledge to help determine the actual cause of the problem. Addressing dashboard warning lights early can help prevent minor faults from developing into more expensive repairs.

Whether your vehicle is showing signs of engine trouble, electrical faults or other mechanical concerns, timely professional attention can help keep your vehicle safe and reliable.